The heart has been estimated to consume 20-30 times its own weight in ATP each day, and mitochondria comprise about 30% of the volume of a cardiomyocyte. In the normal adult heart, fatty acids supply about 60-80% of the organ’s energy needs, with most of the remainder being supplied by glucose. Mitochondrial fatty acid breakdown to yield ATP is called beta oxidation (Chapter 25). When oxygen supplies are limited, cardiomyocytes increase their use of glucose. Aerobic glucose metabolism consumes less oxygen than beta oxidation, and anaerobic glycolysis does not depend on oxygen.
a. increase glucose consumption.
b. decrease glucose consumption.
c. increase fatty acid consumption.
d. increase protein consumption.
Answer : a. increase glucose consumption.
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